Inter.Alg 9.1/9.2 Review

p. 1 #1d  Record your answer in your packet.
Joe Mauer hits a fly ball.  You can track the height of the ball using the equation:
h(t) = -16t^2 + 140t + 2
d) What was the height after 5 secs?

• 44 feet
• 302 feet
• 302 meters
• 44 meters

p. 1 #1e  Record your answer in your packet.
Joe Mauer hits a fly ball.  You can track the height of the ball using the equation:
h(t) = -16t^2 + 140t + 2
e) Why is the 16 negative?

• the ball was hit backwards so it is flying backwards
• The ball starts underground
• It represents gravity

p. 1 #1d  Record your answer in your packet.
Joe Mauer hits a fly ball.  You can track the height of the ball using the equation:
h(t) = -16t^2 + 140t + 2
d) What was the initial upward velocity of the ball?

• -16 feet/sec
• 140 ft/sec
• 2 ft/sec

p. 1 #1b  Record your answer in your packet.
Joe Mauer hits a fly ball.  You can track the height of the ball using the equation:
h(t) = -16t^2 + 140t + 2
b) What is the starting height of the ball?

• 16 feet
• 140 feet
• 2 feet

p. 1 #1a
Joe Mauer hits a fly ball.  You can track the height of the ball using the equation:
h(t) = -16t^2 + 140t + 2
a) What units is this problem in?

• English system/Feet
• Metric System/Meters

p. 2  #21 Record your answer in your packet as well.
Describe the features of the function.
y = - |x| + 12

• parabola, U, up 12
• absolute value, V, up 12, flipped over x axis
• absolute value, V left 12, flipped over x-axis
• parabola, U, right 12, flipped over x-axis

p. 2 #19 Record your answers on your packet as well.
Describe the function:
y = (x + 5)^2 - 3

• absolute value, V shape, left 5, down 3
• absolute value, V, right 5, down 3
• parabola, U, left 5, down 3
• parabola, U, right 5, down 3

p. 2 #11  Record your work and answer in your packet.
Find the y-intercept of the equation
 y = (x + 5)(x - 4)
Hint: plug in zero for x.

• 5 + -4 = 1
• 5 x -4 = -20

p. 2 #8  Please record your answers and work in your packet.
Find the vertex of the equation
y = (x + 5)(x - 4) using the roots.
Hint: average the roots and then plug in the answer.

• (-0.5, -20.25)
• (-1, -20)
• (0.5, -19.25)

p. 2 #10 Record your work and answers in your packet please.
Find the y-intercept for
y = (x - 2)(x + 8)
Hint: plug zero in for x.

• (0, -6)
• (0, -16)